Practice
Quizzes feed a spaced-repetition queue: what you miss comes back sooner, what you know comes back later. Make an account and that queue follows you to every device.
Review today
What the scheduler says is due, and the things you set aside.
Build a skill
The four skills, practised one at a time.
Prepare for an exam
Timed and scored the way the real thing is.
Quick drills
Five minutes on one thing. Every answer feeds your review queue.
Immersive
Longer, unscripted, and the closest thing here to using the language.
All practice modes
Every mode in one list, in case the grouping above hid the one you wanted.
Progress lives in this browser unless you sign in to sync. Browsers can clear local data (iOS Safari does after a week away), so keep a backup if your streak matters to you.